What are the effects of insufficient coolant in the expansion tank?

[VonElaina]

If there is insufficient coolant, it cannot adequately carry away excess heat, causing the engine temperature to continuously rise until the coolant boils and the engine stalls. Some models with intelligent control systems may shut off the coolant flow to the air conditioning and heating circuits when coolant levels are low. Frequent coolant loss in the expansion tank can be caused by several factors: 1. Leak in the cooling system: Frequent coolant loss indicates a leak in the cooling system or a minor head gasket failure. This requires a visit to an auto repair shop for professional servicing. 2. Overheating coolant: The system may lose coolant due to excessively high temperatures. Leaking coolant may be visible at the front of the engine. 3. Seized water pump: This can damage the timing belt, leading to piston-valve contact and related component failures. 4. Blown cylinder head gasket (air or coolant passage): This may cause coolant to mix with engine oil or be expelled through the exhaust pipe.